| abstract |
4,4'-Bis(4-aminophenyl- and 4-aminonaphthyl)azo-benzanilide dyes (I) of formulae (IA) and (IB) are new. X, Y = H, halogen, 1-4C alkyl, 1-4C alkoxy, 1-4C alkylcarbonylamino, arylcarbonylamino, ureido or aryl-ureido; R1 = H, opt. substd. alkyl or aryl or R2; R2 = a cationic or protonisable gp.; or NR1R2 = an opt. substd. 5-, 6- or 7-membered ring, opt. contg. other heteroatom(s). Also claimed are a method for dyeing paper with (IA), (IB) or another mono- or dis-azo dye, which is a 4-phenylazo-aniline or 1-naphthylamine; paper dyed with one of these dyes; and solid or liquid dye formulations contg. the dye(s). |